Duplicator



Patented Dec. 29, 1936 UNITED STA ES 'i' @PHE Application November 26, 1935, Serial No. 51,670 In Japan December 7, 1934 2 Claims. (Cl. 10i- 126) This invention relates to a duplicator, more particularly to a flat duplicator of the type in which a stencil stretching frame is swingably connected at one end to a bed of the duplicator.

One object of the invention is to provide a duplicator of this type in which the position of the stencil stretching frame relative to the bed can be readily adjusted in either direction in horizontal plane.

A further object of the invention is to provide a simple construction of the device for adjusting the printing position of the stencil stretching frame relative to the bed, in which a manipulation of a single part releases and tightens said adjusting device. l

With the above-mentioned objects in View, the duplicator according to the invention comprises a bed, a stencil stretching frame having trunnions, a supporting block having brackets formed with bearing slots adapted to be engaged by said trunnions on the stencil stretching frame, means for mounting said supporting block on the bed portion in manner that it may be slid in both longitudinal and transverse directions, and releasable means for securely uniting said supporting block and the bed.

In the accompanying drawing illustrating one form of the invention:

Figure 1 shows in vertical section a duplicator according to this invention;

Figure 2 is a plan thereof, partly broken away;

Figure 3 shows a side view on somewhat enlarged scale of the hinge portion of the duplicator; and

Figure 4 is a section taken on line IV--IV of Figure 2.

Referring to the drawing, I is a bed of the duplicator, which has a rear extension or foot 2 oiset downwardly from the main portion. 'I'he front end (right hand end in Fig. 1) of the bed I is supported by another foot (not shown). The rear foot 2 is provided with two channels 3 and 4 which are arranged longitudinally of the duplicator, as shown in Figure 2. Said channels are covered by rail bars 5 and 6 respectively, each of which bars is formed with a guide slot l open toward the rear end. A spring bar 8 is provided at both ends with pins 9 and lil which are engaged by the guide slots 'I formed in the bars 5 and 6. In order to prevent the pins 9 and I0 from being removed upwardly out of the guide slots 1, the pins 9 and ID are formed with heads II. At the mid point, the spring bar 8 is provided with a shank I2 extending upwardly and screw threaded at the upper end. Movably mounted upon the rear foot 2 is a supporting cross member or block I3 which is formed with a slot Id arranged transversely of the duplicator. The shank I2 is passed through said transverse slot I4, and a thumb nut I5 is screwed on the projected upper end of the` shank I2. It will be seen that by unscrewing the nut I5 the supporting block I3 is permitted to be slid in either direction, but that when the nut I5 is tightened the spring bar 8 is pulled upwardly so that the heads I I ci the pins 9 and It are pressed against the under sides of the guide rails 5 and 5,.

whereby not only the shank I2 is secured in the transverse slot I4, but also the ends of the spring bar 8 are pulled upwardly and the heads I I of the pins 9 and I il are pressed against the under sides of the guide rails 5 and Ii, so that the supporting block I3 is locked against any movement relative to the foot 2.

The supporting block I3 is provided with brackets I6 secured one on each end thereof. `Each of said brackets I6 has a vertical bearing slot I'I. I8 is a stencil stretching frame and is provided with an extension arm I9 secured on each side thereof near the rear end. Said extension arm I9 carries trunnion 20 which is adapted to be slidably mounted in said bearing slot I7, so that the stencil stretching frame I8 is swingably connected tothe supporting block I3 fixed to the bed I.

Pivoted at 2| to the bracket I6 is a lever 2| which is provided on one arm with a nose 22 adapted to partially close the mouth of the bearing slot I'I and to prevent unintentional removal of the trunnion 20 therefrom when the stencil stretching frame I8 is in its lowered position as shown in Figure 3. On the other arm, the lever 2l is provided with a projection 23. On each side of the stencil stretching frame I3, preferably on the root portion of the extension arm I9, is a pivoted arm 255 which has on its free end a projection 25. A compression spring 26 is connected to said projections 23 and 25, said spring normally tending to lift the stencil stretching frame I8 when the lever 2l and arm 24 are in the position shown in Figure 3, i. e. when the free end of the arm 2li is turned rightwardly and slightly downwardly. 21 is a stop limiting the downward movement of the arm 2li. When the arm 2d is turned upwardly and leftwardly from the position shown in Figure 3, the tension of the spring 26 is released, so that the stencil stretching frame I8 may be manipulated without the influence of said spring 26, and it may be kept in its lowered position by gravity and without necessity of being pressed by hand. The lever 2l is normally held in Xed position with respect to the bracket I6 its loweredposition Without necessity of being pressed by hand, and yet when an initial lifting pressure is applied thereto by hand the frame will be lifted by spring action.

For the sake of simplicity the arrangement of the parts has been` described Withreference to only one side of the duplicator, but it is to be understood that the device on the opposite side is similarly constructed. Y

In the duplicator according to this invention, the position of the stencil stretching frame E3 relative to the bed I in horizontal plane can be altered in any direction by releasing the supporting block I3 so as to be slid in longitudinal as well as transverse directions relative to the foot 2. And such release may be effected merely by unscrewing the nut I5 only, so that the adjustment of the printing position may be readily effected at will.

What I claim is:- Y 1. A flat duplicator comprising a bed having an extension provided with two longitudinal guide slots, a stencil stretching frame having trunnions, a supporting block having brackets formed with bearing slots adapted to be engagedrbysaid trunnions on the stencil stretching frame and provided with a transverse guide slot, a spring bar having at both ends` pins engaged by said longitudinal guide slots in the bed extension and having a central shank extending upwardly through said transverse slot in the supporting block, and means for tightening said spring bar and its shank together with the bed extension and supporting block.

2. A iiat duplicator comprising a bed having an extension provided withtwo longitudinal guide slots, a stencil ,stretching frame having trunnions, a supporting block having brackets formed with bearing slots adapted to be engaged by said trunnions on the stencil stretching frame and provided with a transverse guide slot, a spring bar having at both ends pins engaged by said longitudinal guide slots in the bed extension and having a central shank extending upwardly through said transverse slot in the supporting block, means for tightening said spring bar and its shank together with the bed extension and supporting block, springs connected between the supporting block and the stencil stretching frame for automatically lifting the stencil stretching frame, and means for rendering said springs ineiective.

SKHINJIRO HORII. 

